The game is pretty plain - how long does it keeps being fun solving mazes in the same plain graphics environment? Answer is not for very long. However the author has done a good job with what little game-play value the core mechanics offer and has added fullscreen mode, good music medals and highscores for each and every level. This is the opposite of many authors who create an interesting game with good graphics and nuanced gameplay, but forget to add highscores, fullscreen and medals. The end result is about the same in both cases - an average score.

The reason you are lagging particularly on the larger mazes is likely because you are loading the entire maze all at once. Never do that. Rookie mistake. Instead, separate the maze into pieces of more manageable size, and load only the pieces directly visible to the player and those immediately offscreen but not too far offscreen. And you'll do a lot of swapping.

Also, unless you need to have the player move exactly pixel-by-pixel (you don't) then it's probably best to use a blocky grid-based movement in a game like this, and move only according to blocks and not by pixels, since the maze itself is block-based. This has an added benefit of also reducing lag, in addition to the major lag improvement mentioned above.

It's the little things like this that matter a whole lot.

I got all of the medals. I agree that there is lag, but my bigger complaint is that I would like to have some way of knowing which levels I have already played. The mazes are challenging but become frustrating when I am halfway towards solving one, and I suddenly realize I've done this one already. It would be even better if I could see my previous times so that I could work on bringing them down.

The lag is terrible in 20x20 and simply unbearable in 30x30.

A very fun game with a simple mechanic which anyone can play. Is one of few games that requires pure skill. In a note, maybe a restart button can be a very good idea.

Fantastic work! I really want to see the full game.